Inorganic zeolite/geopolymer composite (Z/GP) was synthesized by controlled zeolitization of synthetic geopolymer from kaolinite and diatomite to be used as a potential catalyst in the transesterification of commercial spent cooking oil (SCO). The Z/GP composite demonstrates promising microstructural properties (106 m²/g surface area and 4.2 nm average pore diameter) and chemical structural enrich in OH and Na⁺ ions as active basic and catalytic centers. The Z/GP composite as catalyst was applied in the transesterification of SCO according to suggested experiment conditions from statistical design which was built based on the Response Surface Methodology. The measured biodiesel yield from SCO over Z/GP catalyst is 98.1% at experimental conditions of 40 °C as temperature, 90 min as time, 12:1 as methanol/SCO ratio, and 3.25 wt, % as Z/GP loading value. The theoretical optimization function of the statistical design suggested potential enhancement for the performance of the reaction to achieve a yield of 99% by adjusting the values of the studied factors at 54.9 °C, 81.9 min, at 12:1, and 3.48 wt, % for the temperature, time, methanol/SCO ratio, and Z/GP loading. The physical properties of the produced SCO-based biodiesel over Z/GP demonstrate the suitability of the product to be used as biofuels considering the criteria to international standards. The kinetic properties of the transesterification reactions of SCO over Z/GP catalyst follow the Pseudo-First order kinetic assumption and occurred with low activation energy. Finally, the synthetic Z/GP as a solid basic catalyst is of significant reusability and reused five times with remarkable biodiesel yields.

无机沸石/地质聚合物复合材料（Z/GP）是通过高岭石和硅藻土的合成地质聚合物受控沸石化合成的，用作商业废食用油（SCO）酯交换的潜在催化剂。Z/GP 复合材料显示出有希望的微观结构特性（106 m ² /g 表面积和 4.2 nm 平均孔径）和富含 OH 和 Na ^{+ 的}化学结构离子作为活性碱性和催化中心。根据基于响应面方法建立的统计设计建议的实验条件，将 Z/GP 复合材料作为催化剂应用于 SCO 的酯交换。在温度为 40°C、时间为 90 分钟、甲醇/SCO 比例为 12:1 和 Z/GP 负载值为 3.25 wt% 的实验条件下，在 Z/GP 催化剂上测得的 SCO 生物柴油产率为 98.1%。统计设计的理论优化函数表明，通过在 54.9 °C、81.9 分钟、12:1 和 3.48 wt% 条件下调整研究因子的值，可以提高反应性能以达到 99% 的产率温度、时间、甲醇/SCO 比率和 Z/GP 加载量。所生产的基于 SCO 的生物柴油在 Z/GP 上的物理特性表明，考虑到国际标准的标准，该产品适合用作生物燃料。Z/GP 催化剂上 SCO 的酯交换反应的动力学性质遵循伪一级动力学假设，并且在低活化能下发生。最后，合成的 Z/GP 作为固体碱性催化剂具有显着的可重复使用性，可重复使用 5 次，生物柴油产量显着。